Use correct oil to prevent engine performance problems on Ford F-350

Problem Description and Possible Solution

Using the correct oil for this engine is critical. Improper engine oil can foam in the high pressure system and not develop enough pressure
for operation. Symptoms of this can be hard starting, long cranking
time before start, rough engine idle, and a lack of power. Another sign
is tiny bubbles in the oil on the engine oil dipstick after the engine
is shut off. The additives in the correct oil that protect against
foaming can still break down, so changing the oil at the correct
intervals is important.